Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6753c2b879ed99…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 11:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8162dbd307900375327e7e46a10e4ef9 SHA-1: 6a005d9d164a2619b82d929bf0dbcca3fee4da23 SHA-256: 9e6753c2b879ed99c3194e2a602a53e331e8ab7f5567435f228b4ff1c0b3c357
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thanhnienxp.com/vietkiendo/upload/file/nokav.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421573a283f---buvoxofipuxa.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ff8848e1---20349186488.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/72665947162.pdf
    • https://slezanie.eu/userfiles/file/jelupeg.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19c21b6f2065604ccb4900381cb29013/sagaxinewaxolilopogudig.pdf
    • http://nenayu.com/filespath/files/20210902115445.pdf
    • https://siltri.com/fck_upload/file/faporixiloxol.pdf
    • https://ofcourselc.com/admin/uploadsfile/togozuxekakakimivomizip.pdf
    • http://mardeestilos.es/fotos/file/48190835882.pdf
    • http://bibikid.ru/upload/vojowukutonelabovevibofag.pdf
    • https://mimpishio1bet.com/contents/files/torokedanesopabokep.pdf
    • https://pmapmc.com/userfiles/image/files/41742353076.pdf
    • https://lasanisports.com/files/jonabetovanodugafa.pdf
    • https://reparationmobile.net/userfiles/file/muneworoxanon.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6dbb22afb4752c4f39ec02a72dac0969/pogoxogipufezibejod.pdf
    • https://thuaphatlaihanoi.net/uploads/files/4039068431.pdf
    • https://media-get.com/userfiles/files/bavozafimuvujav.pdf
    • https://mytekas.com/UserFiles/file/69608951254.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/jujoxudajorud.pdf
    • https://299-45.com/CKEdit/upload/files/65691726970.pdf
    • https://newline-eg.com/userfiles/file/xegoxifijogakalomex.pdf
    • http://jgbt.us/pds/userfiles/files/32335061297.pdf
    • https://fortworthdental.net/cmsCart/upload/file/jabururevapuzaxofibag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=voice+to+text+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 16792 bytes
font_01_sfnt_off0000e0b8.bin
e645a2a6217c2502a8854a134130aca5e0e08f4c89caa32fcc36c05b6ae867f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 10220 bytes
font_02_sfnt_off0000f7cc.bin
ed415948d227e206779304bea0685c9c733a36828ac34d9ca57ddbf5cb89fb52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 17484 bytes